03007 CONCRETE (LIMITED) _ ADDENDUM 2.pdf

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SECTION 03007 – ADDENDUM 2

LIMITED CAST-IN-PLACE CONCRETE, GROUTING,

AND FLOWABLE FILL (CLSM)

PART 1 - GENERAL

1.01 SUMMARY

This Section includes limited cast-in-place concrete, non-shrink grout, grout plugs, and flowable fill/CLSM for the following:

A. Doghouse manhole bases/foundations and other incidental cast-in-place concrete only where shown on the Drawings.

B. Non-shrink cementitious grout for manhole frames/grade rings, benching, patching, and other manhole grout applications required by the Contract Documents.

C. Abandonment/void filling where shown on the Drawings, including filling abandoned pipes/manholes/structures with flowable fill (abandonment grout) and/or grout plug work where required.

D. Concrete pavement trench caps are not part of this Project unless explicitly shown on the Drawings. Pavement restoration is per the Drawings and applicable paving/restoration sections.

1.02 REFERENCES

A. Concrete:

1. ACI 301.

2. ACI 318.

3. ASTM C94 (Ready-Mixed Concrete).

4. ASTM C150 (Portland Cement); ASTM C33 (Aggregates).

5. ASTM C260 (Air-Entraining Admixtures); ASTM C494 (Chemical Admixtures).

6. Georgia Department of Transportation (GDOT) Standard Specifications for the Construction of Transportation Systems (2021 Edition), as amended by current GDOT Supplemental Specifications, including Section 500 — Concrete Structures.

B. Grout:

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1. ASTM C1107 (Packaged Dry, Hydraulic-Cement Grout – Nonshrink).

2. USACE CRD-C621 (Non-Shrink Grout).

C. CLSM / Flowable Fill:

1. ASTM D4832 (CLSM compressive strength, molding/cure).

2. ASTM D6103 and/or ASTM C143/C143M (flow/slump as used in the Contract Documents).

3. Georgia Department of Transportation (GDOT) Standard Specifications for the Construction of Transportation Systems (2021 Edition), as amended by current GDOT Supplemental Specifications, including Section 600 — Controlled Low Strength Flowable Fill.

1.03 SUBMITTALS

A. Submittals shall conform to requirements of Section 01300 – Submittals.

B. Cast-in-Place Concrete: mix design(s) for each class of concrete proposed.

C. Non-shrink grout: manufacturer’s installation instructions for mixing, handling, surface preparation, and placing.

D. Flowable Fill/CLSM: mix design(s) and supplier information for each CLSM type proposed.

E. When abandonment/void filling is required: proposed means and methods for mixing/placement and any required staging/vents/bulkheads where applicable.

1.04 MEASUREMENT AND PAYMENT

A. Refer to Section 01150 – Measurement and Payment

PART 2 - PRODUCTS

2.01 CAST-IN-PLACE CONCRETE

A. Provide ready-mixed concrete conforming to ASTM C94.

B. Concrete Strength: Class C – Normal Weight, 3,000 psi @ 28 days unless otherwise specified.

C. Air Entrainment: conform to ASTM C260. Add air entraining agent for concrete subject to freeze-thaw cycling.

D. Chemical admixtures (if used): conform to ASTM C494.

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2.02 NON-SHRINK CEMENTITIOUS GROUT

A. Provide non-shrink cementitious grout conforming to ASTM C1107 and

CRD-C621.

B. Provide pre-mixed ready-for-use formulation requiring only addition of water; non-shrink, non-corrosive, non-metallic, non-gas forming, and no chlorides.

C. Performance: capable of developing minimum compressive strength of 2,400 psi in 48 hours and 7,000 psi in 28 days.

2.03 GROUT PLUGS (WHEN REQUIRED)

A. Packaged dry, non-shrink, non-metallic, non-corrosive hydraulic-cement grout conforming to ASTM C1107, Grade B or Grade C.

B. Minimum compressive strength (as applicable to grout plug material):

1. At one day: 1,000 psi

2. At three days: 2,500 psi

3. At seven days: 3,500 psi

4. At 28 days: 5,000 psi

2.04 FLOWABLE FILL / CLSM (ABANDONMENT GROUT / VOID FILL)

A. Provide controlled low strength material (CLSM) / flowable fill meeting the requirements of the Contract Documents and the approved mix design.

B. Consistency / Slump (Flowable Fill): minimum 6 inches and maximum 8 inches when tested in accordance with the Contract Documents.

C. Strength:

1. CLSM shall have a minimum 28-day compressive strength of 100 psi when molded and cured in conformance with ASTM D4832.

2. Where an “excavatable” CLSM is required (as indicated on Drawings or directed), maximum 28-day compressive strength shall be 100 psi.

3. Where a “non-excavatable” CLSM is required (as indicated on Drawings or directed), minimum 28-day compressive strength shall be 125 psi.

D. Admixtures: chemical admixtures that do not contain calcium chloride and conform to ASTM C494 may be used in the CLSM mix.

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PART 3 - EXECUTION

3.01 GENERAL

A. Perform work in accordance with manufacturer’s written instructions for grout products and in accordance with approved mix designs for concrete and CLSM.

3.02 CAST-IN-PLACE CONCRETE PLACEMENT

A. Verify items to be cast into concrete are accurately placed and secured prior to placement.

B. Place concrete continuously between predetermined construction limits.

Avoid cold joints.

C. Field testing/logging: obtain delivery tickets and maintain records including location of placement and slump as required by the Contract Documents. Slump testing and cylinders shall be performed when required.

D. The Contractor shall complete reconnection of all service lines within 24 hours.

3.03 NON-SHRINK GROUT PLACEMENT

A. Surface preparation and placement shall follow manufacturer’s installation instructions (mixing, handling, surface preparation, and placing).

B. Protect grout from adverse temperature conditions and premature drying consistent with manufacturer instructions.

3.04 FLOWABLE FILL / CLSM PLACEMENT (ABANDONMENT GROUT / VOID

FILL)

A. CLSM shall be placed with self-compacting/self-leveling characteristics suitable to flow into intended voids/openings.

B. Consistency shall be such that the material flows easily into openings between the pipe and the lower portion of the trench (as applicable).

C. Where trenches are on steep slope, a stiffer mix may be required to prevent CLSM from flowing down the trench (as applicable).

D. Place CLSM as required to achieve complete filling; perform visual inspection during mixing and placement to verify consistency/slump/stiffness is appropriate for the location and type of installation.

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3.05 FIELD QUALITY CONTROL

A. Concrete: Provide delivery tickets for each load. Perform slump tests and compressive strength testing when required by the Contract Documents or directed by the Engineer.

B. CLSM: Provide delivery tickets/mix identification. Perform flow/slump and compressive strength testing when required by the Contract Documents or directed by the Engineer.

C. Grout: Mix and place in accordance with manufacturer’s instructions.

Field testing will be performed only if directed by the Engineer.

D. Cleanup: Remove waste materials and excess concrete/grout/CLSM from the site. Prevent discharge of cementitious materials to storm drainage systems.

**END OF SECTION**